I had the chance to paddle the Dagger Stratos 14.5L last Sunday. Fun little touring kayak! It has an adjustable skeg, which is a first for me. In short it is a fin you lower more or less depending on how much tracking you need. I thought it tracked relatively well even without using the skeg, but when you use the skeg it becomes much harder to turn naturally. The cockpit is great with thigh braces and a solid foot brace, very comfy position. It is very stable and the cockpit is long enough to be able to sit first and then slide your legs in.
I wanted to check the speed because I read reviews complaining about its slowish cruising speed. I thought it was fine: I can keep the 8 km/h (5 mph) for hours but it does feel heavy compared to the Riot Edge 14.5 which is much narrower (22" - 57 cm vs 24.5" - 62.23 cm for the Stratos 14.5) for the same length.
My paddle is an Orka Super Flex Pro. I am in my mid fifties and not exactly fit...